In an AC. circuit, a low value of kVAR compared with kW indicates_________?

Related Mcqs:

1. In a series resonant circuit, the impedance of the circuit is___________?

   A. minimum
   B. maximum
   C. zero
   D. none of the above

2. All the rules and laws of D.C. circuit also apply to A.C. circuit containing_____________?

   A. capacitance only
   B. inductance only
   C. resistance only
   D. all above

3. The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is_________?

   A. 4 kVAR
   B. 6 kVAR
   C. 8 kVAR
   D. 16 kVAR

4. The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is__________?

   A. 12 kW
   B. 22 kW
   C. 32 kW
   D. 64 kW

5. If resistance is 20 Q. and inductance is 27 in a R-L series circuit, then time constant of this circuit will be________?

   A. 0.001 s
   B. 0.1 s
   C. 10 s
   D. 100 s

6. Which of the following circuit component opposes the change in the circuit voltage ?

   A. Inductance
   B. Capacitance
   C. Conductance
   D. Resistance

7. At very low frequencies a series R-C circuit behaves as almost purely___________?

   A. resistive
   B. inductive
   C. capacitive
   D. none of the above

8. In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value__________?

   A. will change the maximum value of current at resonance
   B. will change the resonance frequency
   C. will change the impedance at resonance frequency
   D. will increase the selectivity of the circuit

9. The r.m.s. value of alternating current is given by steady (D.C.) current which when flowing through a given circuit for a given time produces__________?

   A. the more heat than produced by A.C. when flowing through the same circuit
   B. the same heat as produced by A.C. when flowing through the same circuit
   C. the less heat than produced by A.C. flowing through the same circuit
   D. none of the above

10. In R-L-C series resonant circuit magnitude of resonance frequency can be changed by changing the value of__________?

    A. R only
    B. L only
    C. C only
    D. LorC
    E. R,LorC